Ethernet Speed / Duplex / Autonegotiation Troubleshooting

Mismatched Ethernet settings can cause all sorts of network hell.  This chart shows the outcome of each possible configuration.

Autonegotiation Valid Configuration Table

Running the 32-bit version of Firefox on RHEL when both 32-bit and 64-bit versions are installed

If you are running a 64-bit version of RHEL and have both the 32-bit and 64-bit versions of Firefox installed, the 64-bit version will run by default. This is a quick and easy way to call the 32-bit version.

Why might you want to use the 32-bit version over the 64-bit version? 32-bit plugins won’t run on 64-bit Firefox, or vice versa. If you have to run a 32-bit plugin, you must use 32-bit Firefox.

This was tested with Firefox 3.0.9 on RHEL 5.3 x86-64.


# cp /usr/bin/firefox /usr/bin/firefox-32
# sed -i "s/lib64/lib/g" /usr/bin/firefox-32

After this is done, running firefox will start the 64-bit version and running firefox-32 will start the 32-bit version.

vi Quick Reference

vi Quick Reference

Veritas Storage Foundation Quick References

Quick References for Veritas Volume Manager (VxVM) and Veritas File System (VxFS).

Veritas Cluster Server Cheat Sheet

VCS Cheat Sheet

UNIX tips: Learn 10 good UNIX usage habits

When you use a system often, you tend to fall into set usage patterns. Sometimes, you do not start the habit of doing things in the best possible way. Sometimes, you even pick up bad practices that lead to clutter and clumsiness. One of the best ways to correct such inadequacies is to conscientiously pick up good habits that counteract them. This article suggests 10 UNIX command-line habits worth picking up — good habits that help you break many common usage foibles and make you more productive at the command line in the process. Each habit is described in more detail following the list of good habits.

http://www.ibm.com/developerworks/aix/library/au-badunixhabits.html

Piping from cat was a habit I had for a long time. I’m mostly over it, but it still rears its head from time to time.

The Definitive Guide to Bash Command Line History

Let me teach you how to work efficiently with command line history in bash.

This tutorial comes with a downloadable cheat sheet that summarizes (and expands on) topics covered here…

http://www.catonmat.net/blog/the-definitive-guide-to-bash-command-line-history/